____ the problem of method is solved, talking about the task is useless.A．UntilB

题型：不详难度：来源：

____ the problem of method is solved, talking about the task is useless.

A．Until

B．Since

C．After

D．Unless

答案

解析

略

举一反三

We have produced 15% more cotton this year____ we did last year.

A．as

B．than

C．like

D．white

题型：不详难度：| 查看答案

It is late; ____, I"m too tired to go out.

A．besides

B．except

C．except for

D．except that

题型：不详难度：| 查看答案

Everything around us is ____ solid ..liquid ____ gas.

A．not .. .but...

B．either.. .or...

C．neither.. .nor...

D．whether.. .or...

题型：不详难度：| 查看答案

He will come ____ you ask him.

A．whether

B．unless

C．if

D．while

题型：不详难度：| 查看答案

____ he will come or not is still unknown.

A．If

B．Where

C．That

D．Whether

题型：不详难度：| 查看答案